FSRS is a spaced-repetition scheduler that picks the next review time from your ratings, not a fixed calendar. For vocabulary, that means you meet each word again when you are about to forget it, as long as you rate honestly.
It is a timing tool for cards you already made. It is not a full language course and not a fluency promise.
What does FSRS stand for?
FSRS means Free Spaced Repetition Scheduler. After you try a card, you say how hard it felt. The scheduler updates how stable that memory looks, then sets the next due date earlier or later for you.
You do not need the math. You need honest ratings. Mash "easy" on cards you barely know and any scheduler will lie to you.
For a longer plain-English walkthrough, see What FSRS means for vocabulary.
Why use it for vocabulary?
Words fade on a curve. Cramming packs them in for a test day; spaced reviews keep more of them usable later. FSRS is one way to space those reviews using your history instead of "every three days forever."
If the drop-off story is fuzzy, start with Why You Forget 80% of New Words. Pictures help many people encode the word first (Why I put a picture on the front of vocab cards); the scheduler helps you meet it again in time. Neither one replaces speaking practice or grammar study.
How does a simple FSRS vocab loop work?
- Make a card (word, translation, image you chose).
- When it is due, try to recall it.
- Rate the recall honestly.
- Let FSRS set the next interval.
That is the whole loop. No settings rabbit hole required for a focused vocab habit.
What are the limits?
FSRS will not teach conversation by itself, fix junk cards, or guarantee you keep every word forever. Vague prompts and dishonest ratings still fail. Clear cues plus on-time reviews are the boring combo that works.
If you want that loop in product terms, open How Vidi Works when you are ready.